Pneumatic painting apparatus



` 1,518,135 J. H. CAHILL, 'PNEUMATIG PAINTING APRATus l Filed Feral 23. 1922 James H. canin Patented Dec. 9, 1924.

F'FICE',l

JAMES H. CAHILL, OF CHICAGO, ILLINOIS, ASSIGNOR TO SEARS, ROEBUCK AND CO., OF CHICAGO, ILLINOIS, A, CORPORATION OF NEW YORK.

PNEUMATIC PAINTING APPARATUS.

Application led February 23, 1922. Serial No. 538,572.

To all whom t may concern.'

Be it known that I, JAMES H. CAHILL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pneumatic Painting Apparatus, of which the following is a specication.

The invention relates to a pneumatic painting apparatus, and has for its general aim the provision of an improved means for clamping the cover of the receptacle in position upon the main or body portion.

In'pneumatic spraying apparatus of the general character to which my invention re` lates, the paint receptacle is usually of substantial size and weight, and the air and paint tubes are commonly connected with the cover which is screw-threaded upon the body portion. Considerable inconvenience has therefore been experienced in removing the cover owing to the fact that it is practically impossible to accomplish this result without rotating the cover with respect to the paint receptacle with a resulting twist ing and entangling of the air and paint tubes.

The object of my invention is to produce an improved clamping means such that the .zo cover may be quickly and easily secured in operative or closed position, or removed to open the receptacle, and this object is attained by the provision of a rotary clamping device having a rotatable and sliding engagement with one of the parts, and a rotary interlocking engagement, such for example as is provided by screw-threads, with the other one of the parts.

In the accompanying drawings I have illustrated a preferred form of my invention, but it will be understood that various changes in the form, construction and arrangement o-f the parts may be made by those skilled in the art without departing from the spirit and scope 0f theI invention as expressed in the appended claims.

Figure 1 of the drawings is a perspective view of a pneumatic painting apparatus embodying my invention. Fig. 2 is a fragmentary vertical sectional view through the upper portion of the paint receptacle. Fig. 3 is a fragmentary plan view of the apparatus.

The receptacle of the apparatus is indicated generally at 7 and is mounted upon wheels 8 lso as to be readily portable. 9, 10

and 11 designate, respectively, various tubes parent that it is impracticable to rotate the head to remove it Without first disconnecting the air and paint tubes therefrom. When, therefore, a simple screw-threaded connection between the head 7b and the body portion 7n is employed, yconsiderable difficulty is encountered in the use of the apparatus, as when it is necessary to replenish the supply of paint in the receptacle.

The means which I employ for connecting the head 7 b to the body portion 7a comprises a collar 12 made rigid with the upper end of the receptacle as by brazing, and a clamping ring 13 having a rotatable and sliding engagement with the head 7b and a rotary interlocking engagement with the collar 12 of the body portion. To provide for the rotatable sliding engagement of the ring with the head, the latterhas a depending annular portion or skirt of substantial depth having near its upper end an annular shoulder 14 with which an inturned flange 15 on the ring slidably engages; and the rotary interlocking connection between the ring and the body portion of the receptacle is in the form of interengaging screw threads 16 on the ring and the collar. Preferably the ring has formed integral therewith an annular rim 17 forming with the ring a hand wheel for facilitating the operation of the clamping means.

For retaining the ring in sliding engageH ment with the head when the latter is removed from the body portion of the receptacle, I provided a device comprising a flange 19 which in the present instance is made in the form of a ring separate from the head 7b and is secured thereto by means of screws 20.

It will be apparent that by the clamping device which I have provided, the head 7b of the receptacle may be secured in closed position upon the body portion or removed therefrom with eXtreme facility, and in a manner which avoids the twisting and entangling of the paint tubes. Moreover, the

construction is of utmost simplicity so that the cost of the apparatus is not materially increased.

I claim as my invention:

l. In a pneumatic painting apparatus, in combination, a paint receptacle comprising a body portion, an annular upstanding flange on the upper end of said boc y portion, an annular shoulder on said body portion located externally of and at the base. of said flange, a head for closing said body, said head having an annular depending flange engaging said shoulder and fitting around said first mentioned flange, an annular external shoulder on said head, a ring having a flange engaging said external shoulder and having screw threaded engagement with said body portion belo-w said first mentioned flange, and a retaining means mounted externally on said head and engaging said ring to secure the ring rotatably to the head.

2. In a pneumatic painting apparatus, in combination, a paint receptacle comprising a body portion, a head providing a closure for said body portion, said head having an annular external shoulder, a ring having an inwardly extending flange engagdng said shoulder and having screw threaded connection with said body portion, and an annular flange secured to said head, said flange overlying the upper edge of said ring to seeure the ring rotatably to the head.

In testimony whereof, I have hereunto affixed my signature.

JAMES VI-I. CAHILL. 

